Lab Exercise:  Moles and Molar Mass: “Weighing as a Means of Counting”                                   NAME:_________________

Part I: Determining the number of moles in a sample.

            For the following items measure the mass and then calculate the number of moles of each.  Finally, calculate the number of particles.

1. Measure the mass of a spoonful of table salt (NaCl), a glass slide (SiO₂), an aluminum nugget and a copper penny. 

2. Record the masses in the table below.

3. Based on the chemical formula determine the molar mass of each substance.

4. Showing your work, calculate the number of moles in each quantity.

5. Showing your work, calculate the number of particles in each quantity.

Substance                   mass (g)                   molar mass (g)                    moles                  particles

Part 2: Measuring out a specific amount of a substance.

For the following items, first calculate the mass that would contain the specified amount of moles or particles.  Then measure that quantity out.

1. Measure out a mass of tin shot (Sn) that contains 5.03 x 10²² atoms of tin.

2. Measure out a mass of sucrose (C₁₂H₂₂O₁₁) that contains 0.0322 moles.

3. Measure out a mass of water that contains 3.01 x 10²³ molecules.

Substance                   mass (g)               molar mass (g)                    moles                  particles

Questions:  Answer the following questions in the space provided, showing your work.

1. What would be the mass (in kilograms) of a mole of copper pennies.
   
   
2. Given that the density of water is 1.0 g/mL how could you also measure out the quantity of water with the mass you have above?
   
   
   
3. What volume (in liters) would contain 4.75 X 10²² atoms of neon at STP?